# package on a package

> integrated circuit packaging method

**Wikidata**: [Q130652](https://www.wikidata.org/wiki/Q130652)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Package_on_a_package)  
**Source**: https://4ort.xyz/entity/package-on-a-package

## Summary
Package on a package (PoP) is a semiconductor packaging method that stacks multiple integrated circuits (ICs) vertically to minimize space while maintaining high performance. It belongs to the multi-chip module class and is distinct from system-in-package (SiP) designs. PoP is widely used in compact electronics like smartphones and tablets.

## Key Facts
- **Aliases**: PoP, package on package.
- **Classification**: Subclass of multi-chip module; instance of semiconductor package.
- **Differentiation**: Differs from system in package (SiP), which integrates heterogeneous components in a single package.
- **Documentation**: 10 sitelinks across Wikipedia languages (ca, de, en, fa, hu, it, ko, nl, zh) and a dedicated Commons category ("PoP integrated circuit packages").
- **Academic Reference**: Microsoft Academic ID (discontinued): 184788189.
- **Parent Category**: Multi-chip module (12 sitelinks).

## FAQs
### Q: What is the primary purpose of package on a package?
A: PoP enables the stacking of multiple integrated circuits in a single package to optimize space and performance in compact electronic devices.

### Q: How does PoP differ from system in package (SiP)?
A: PoP focuses on vertical stacking of homogeneous ICs, while SiP integrates diverse components (e.g., processors, memory) into a single package.

### Q: Where is package on a package commonly used?
A: It is widely adopted in mobile devices (e.g., smartphones, tablets) and other space-constrained electronics requiring high processing power.

## Why It Matters
Package on a package plays a critical role in advancing miniaturization and performance in modern electronics. By stacking ICs vertically, PoP reduces the footprint of semiconductor components, enabling thinner and lighter devices without compromising functionality. This innovation directly addresses the demand for powerful, compact systems in consumer electronics, IoT devices, and automotive technologies. PoP also streamlines manufacturing and design processes by allowing modular integration of memory and processors, which accelerates product development cycles. Its impact is evident in the widespread adoption across industries reliant on high-density, energy-efficient computing solutions.

## Notable For
- **Stacked Architecture**: Enables vertical integration of ICs (e.g., memory stacked on processors).
- **Modular Design**: Facilitates easier integration and upgrades compared to traditional planar packaging.
- **Mobile Technology**: Key enabler of slim, high-performance smartphones and tablets.
- **Distinct Standardization**: Separated from system-in-package (SiP) through focused stacking protocols.
- **Cross-Industry Adoption**: Utilized in telecommunications, automotive systems, and wearable devices.

## Body
### Definition & Classification
Package on a package (PoP) is a semiconductor packaging methodology defined by the vertical stacking of integrated circuits. It is classified as a subclass of multi-chip modules (MCMs) and functions as a discrete electronic assembly. PoP operates as a single unit while maintaining the modularity of individual ICs.

### Technical Specifications
- **Structure**: Typically involves a base package (e.g., processor) with one or more stacked packages (e.g., memory).
- **Compatibility**: Designed for interoperability with standard printed circuit boards (PCBs).
- **Materials**: Utilizes advanced semiconductor materials and soldering techniques for reliable electrical connections.

### Differentiation from Similar Technologies
PoP is distinct from **system in package (SiP)**, which combines heterogeneous components (e.g., CPUs, GPUs, RAM) into a single package. Unlike SiP, PoP emphasizes vertical stacking of homogeneous or complementary ICs without full system integration.

### Applications & Adoption
- **Consumer Electronics**: Central to smartphones, tablets, and laptops requiring compact, high-density computing.
- **Telecommunications**: Used in baseband processors and RF modules for 5G devices.
- **Automotive Systems**: Supports advanced driver-assistance systems (ADAS) and infotainment modules.

### Academic & Documentation References
- **Wikipedia Coverage**: Documented across 10 language editions, with a dedicated article ("Package on a package").
- **Commons Category**: "PoP integrated circuit packages" hosts visual documentation of implementations.
- **Discontinued IDs**: Previously tracked under Microsoft Academic ID 184788189.

## References

1. Freebase Data Dumps. 2013
2. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)